I picked up this radio thinking it was a 10S155. When I went to pick it up I noticed that it had an 8S154 chassis in it. Is it possible that Zenith put some 8 tube chasses in the higher end cabinets at the end of the production run? Or is it more likely that someone retrofitted it?Thanks,Joe

The two model numbers described different combinations of chassis and cabinet. The paper sticker containing the tube placement guide should describe the intended configuration of the radio. If the sticker is missing or defaced, I'd suspect that a "frankenradio" has been created.

"Are you sure it wasn't a 10-S-668?https://radioattic.com/item.htm?radio=0021023It looks very much like the 12-H-670 but has the same chassis as the 669."You might be right about that one. They do look the same.I know the 9S-262 was tagged wrong because I went to an antique store on S. Broadway in Denver one Sunday with my wife and we saw a dealer unloading the Zenith from his car. I saw the paper tag and thought wheee! a 12 tuber or some odd variant. I bought it on the spot. It was a mis-tagged cabinet, but still well worth what I paid.